Eric Sink's book --> http://www.ericsink.com/bos/Business_of_Software.html

Podcast on the topic from Scott --> Hanselminutes Podcast 47 - How to start your own MicroISV

25 steps on secreetgeek.net --> http://secretgeek.net/25steps.asp

I recommend comprehend the material in the order listed here. Book give you reqlly good base, espeacially if you don't have a business degree. Leon Bambrick in his interview and his blog gives some practical perspective.

Pragmatic Programmers is my favorite publisher.
Now they also have a podcasts http://www.pragprog.com/podcasts